Aquarium filter cartridge element



FIG. 1 is an isometric view of an aquarium filter cartridge element incorporating our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a rear elevation view thereof.

The broken lines are for illustration only, and form no part of the claimed design. 

The ornamental design for an aquarium filter cartridge element, as shown and described. 